TBM双刃滚刀贯入红砂岩破岩特征与裂纹扩展机制研究OA
Rock fragmentation characteristics and crack propagation mechanism in red sandstone induced by penetration of TBM double-disc cutters
为探究全断面隧道掘进机(tunnel boring machine,简称TBM)双刃滚刀破岩特征与裂纹扩展机制,开展2种刃型和不同刀间距下的缩尺双刃滚刀贯入红砂岩试验与数值模拟研究,分析了双刃滚刀贯入破岩的力学响应、破坏特征及破碎效率,基于连续-非连续单元法(continuous-discontinuous element method,简称CDEM)揭示贯入破坏过程及裂纹扩展机制.结果表明:2 种刃型双刃滚刀的破岩特征与力学响应显著不同,相较于双刃楔形滚刀,双刃常截面滚刀作用下的破碎坑轮廓规整,破碎坑底部起伏度小,岩石剖面少有宏观裂纹;双刃滚刀协同作用时受叠加应力场的相互影响,峰值荷载随刀间距增大呈先降后增的趋势,破碎比能耗也随刀间距增大呈先降后增的趋势,均在刀间距s=16 mm 时达到最小值;在较低贯入深度下,楔形滚刀优先产生拉伸裂纹并造成局部破坏,拉伸裂纹占比显著高于常截面滚刀,常截面滚刀刀间的拉伸裂纹可更快交汇贯通,随着贯入深度增大,密实核区域的剪切裂纹持续扩展,2 种滚刀的拉伸裂纹占比趋近;双刃常截面滚刀始终产生更大的损伤区及强损伤区,表明其能量集中耗散于损伤区扩大及剪切裂纹扩展.本研究可为TBM双刃滚刀刀间距与刃型的设计及选型提供参考.
To explore the rock fragmentation characteristics and crack propagation mechanism of tunnel boring machine(TBM)double-disc cutters,scaled penetration tests and numerical simulations were carried out on red sandstone,employing double-disc cutters with two distinct cutter-edge profiles at varying cutter spacings.The mechanical response,failure characteristics,and fragmentation efficiency during rock fragmentation induced by double-disc cutter penetration were subsequently analyzed.The penetration failure process and crack propagation mechanism were revealed using the continuous-discontinuous element method(CDEM).The results show that the rock fragmentation characteristics and mechanical response of the two blade-types of double-disc cutters exhibit significant differences.Compared with the double-disc wedge-shaped cutter,the double-disc cutters with constant cross-section generate a more regular crushing pit profile,characterized by reduced undulation at the crushing pit base and fewer macroscopic cracks on the rock profile.When double disc cutters work synergistically,their superimposed stress fields interact.Both the peak penetration force and the specific energy for rock fragmentation exhibit a trend of first decreasing and then increasing with increasing cutter spacing.Both parameters reach their minimum values at a cutter spacing of s=16 mm.At lower penetration depths,wedge-shaped cutters preferentially generate tensile cracks and cause localized failure,with a significantly higher proportion of tensile cracks compared to constant cross-section cutters.Tensile cracks between constant cross-section cutters can coalesce faster.As penetration depth increases,shear cracks in the compacted core zone continuously propagate,and the proportion of tensile cracks for two types of cutters converges.Double-disc constant cross-section cutters consistently produce larger damaged zones and severely damaged zones,indicating that their energy is concentratedly dissipated in damage zone expansion and shear crack propagation.This study can provide a reference for the design and selection of cutter spacing and cutter-edge profiles for TBM double-disc cutters.
周辉;齐资源;卢景景;肖建成
中国科学院武汉岩土力学研究所 岩土力学与工程安全全国重点实验室,湖北 武汉 430071||中国科学院大学,北京 100049中国科学院武汉岩土力学研究所 岩土力学与工程安全全国重点实验室,湖北 武汉 430071||中国科学院大学,北京 100049中国科学院武汉岩土力学研究所 岩土力学与工程安全全国重点实验室,湖北 武汉 430071||中国科学院大学,北京 100049中国科学院武汉岩土力学研究所 岩土力学与工程安全全国重点实验室,湖北 武汉 430071||中国科学院大学,北京 100049
建筑与水利
TBM双刃滚刀贯入试验破岩特征裂纹扩展连续-非连续单元法(CDEM)
TBM double-disc cutterspenetration testrock breaking characteristicscrack propagationcontinuum-discontinuum element method(CDEM)
《岩土力学》 2026 (8)
2568-2580,2597,14
国家自然科学基金-铁路基础研究联合基金重点项目(No.U2468215)岩土力学与工程安全全国重点实验室基金(No.SKLGME-JBGS2401)中国科学院前沿科学重点研究计划(No.ZDBS-LY-DQC022).This work was supported by the Key Program of the Joint Fund for Railway Basic Research under the National Natural Science Foundation of China(U2468215),the Fund of State Key Laboratory of Geomechanics and Geotechnical Engineering Safety(SKLGME-JBGS2401)and the Key Research Program of Frontier Sciences,CAS(ZDBS-LY-DQC022).
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